With regard to the estimation and interpretation of the recurrence of risks for genetic disorders,nurses should be aware that:
A)With a dominant disorder, the likelihood of the second child also having the condition is 100%.
B)An autosomal recessive disease carries a one in eight risk of the second child also having the disorder.
C)Disorders involving maternal ingestion of drugs carry a one in four chance of being repeated in the second child.
D)The risk factor remains the same no matter how many affected children are already in the family.

Question

Quizplus · Accepted Answer

Each pregnancy is an independent event.The risk factor (e.g.,one in two,one in four)remains the same for each child,no matter how many children are born to the family.
In a dominant disorder,the likelihood of recurrence in subsequent children is 50% (one in two).An autosomal recessive disease carries a one in four chance of recurrence.In disorders involving maternal ingestion of drugs,subsequent children would be at risk only if the mother continued to take drugs; the rate of risk would be difficult to calculate.

With Regard to the Estimation and Interpretation of the Recurrence